class GetReady extends Basic {
  constructor() {
    super()
    this.img = new Image()
    this.img.src = './FlappyBird/text_ready.png' // logo图片
    this.w = 200
  }
  render() {
    ctx.drawImage(this.img, (data.cw - this.w) / 2, 100) // 渲染logo图片
  }
}